Force variables alignment in MC56F8XXXX DSC

[cabl]

Hi there,

How could one easily force alignment of variables in code (avoiding creation of specific section in linker files, and explicit placement via OBJECT)? Something similar to the #pragma pack present in other micros.

Thanks.

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Hola,

¿Cómo se puede fozar fácilmente la alineación de variables desde el código (evitando crear secciones nuevas en el fichero del linker y evitando tener que colocar cada variable con OBJECT)? Algo parecido a #pragma pack existente para otros micros.

Gracias.

[Ben]

I think that the ALIGN command will do what you need. See ALIGN and ALIGNALL in the ELF linker file issue.

[cabl]

Hi Ben,

thanks for your answer.

However, as far as I know, ALIGN is for the linker file, not for the code (*.c) file. I´m looking for a more flexible way that doesn´t imply changing linker file.

Best regards,

[Ben · Accepted solution]

Hi Carlos

Good news. I found out that one of our customers is doing exactly what you need.

The "trick" he used is adding attribute to variable definition. For example:

char test[6]       __attribute__((aligned(2)));

I did not try it yet.

If someone of CW staff watching this place, please comment. I saw no CW documentation for using attributes in code, only for LCF

I hope it helps

[cabl]

Hi Ben,

thank you for the info. I´ve found that from CW10.6 on it´s possible to do __attribute__((aligned(2))), though it seems that __attribute__((aligned(1))) is not working.

Regards

[Ben]

Hi Carios

Thats correct, but you can add once to the linker file a section with ALIGNALL definition, and in the code putting the variables you want to align in this section.

The problem I have with the alignment is that you can not align data to 1 byte long, the minimum is 2 bytes. in data communication I need 1 byte too